With a 1300 lb. capacity, Middle Atlantic's commercial grade caster bases are equipped with heavy duty non-locking 3" swivel wheels and are UL listed in the US and Canada. NEW fine floor caster bases now available with a 700 lb. weight capacity. Each base comes with its wheels preinstalled to save time, fits inside rack, and raises total rack height only .94" (CBS-ERK raises the rack 3-3/4"). Caster base works with LF leveling feet.